CO in middle of pattern help

Need help with how to CO 12 stitches in middle of a pattern.
Completed row 39 and row 40 says:
CO 12 sts, knit to end of row.
Does this mean CO on left hand needle with other stiches already there and then knit all of them or do you CO the 12 stitches on the right needle and then knit the others that are on the right hand needle? This is Lion Brand Pattern (free) Bunny Blanket Buddy. I am just confusing myself over something that should be so simple. It is to add paws to the body of the bunny> Help!

I had my DUH moment. Figured it out.